Observations of the 86 GHz SiO maser sources in the Central Parsec of the Galactic Centre

A. Borkar, Andreas Eckart, Christian Straubmeier, Nadeen B Sabha, Loŕant Oliver Sjouwerman, Vladimir Karas, Devaky Kunneriath, Lydia Moser, Silke Britzen, Mónica Valencia-S, Alina Donea, Anton J Zensus

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch


We present results of 3 mm observations of SiO maser sources in the Galactic Centre (GC) from observations with the Australia Telescope Compact Array between 2010−2014, along the transitions of the SiO molecule at v=1,J=2−1 at 86.243 GHz and v=2,J=2−1 at 85.640 GHz. We also present the results of the 3 mm observations with Atacama Large Millimeter/Submillimeter Array (ALMA). We detected 5 maser sources from the ATCA data, IRS 7, IRS 9, IRS 10EE, IRS 12N, and IRS 28; and 20 sources from the ALMA data including 4 new sources. These sources are predominantly late-type giants or emission line stars with strong circumstellar maser emission. We analyse these sources and calculate their proper motions. We also study the variability of the maser emission. IRS 7, IRS 12N and IRS 28 exhibit long period variability of the order of 1−2 years, while other sources show steady increase or decrease in flux density and irregular variability over observation timescales. This behaviour is consistent with the previous observations.
Original languageEnglish
Title of host publicationProceedings of Science
EditorsFranco Giovannelli, Lola Sabau-Graziati
Place of PublicationItaly
PublisherSissa Medialab, SRL
Number of pages22
Publication statusPublished - 3 Dec 2020
EventMultifrequency Behaviour of High Energy Cosmic Sources, 2019 - Palermo, Italy
Duration: 3 Jun 20198 Jun 2019
Conference number: 13th

Publication series

NameProceedings of Science
PublisherSissa Medialab
ISSN (Electronic)1824-8039


ConferenceMultifrequency Behaviour of High Energy Cosmic Sources, 2019
Abbreviated titleMULTIF2019
OtherThis is the thirteenth edition of the series of Frascati Workshops on "Multifrequency Behaviour of High Energy Cosmic Sources" which is undoubtedly a largely accepted biennial meeting in which an updated experimental and theoretical panorama will be depicted. This edition comes at the 35th anniversary of the first historical "multifrequency" workshop about "Multifrequency Behaviour of Galactic Accreting Sources", held in Vulcano in September 1984. This surely renders the Frascati Workshop Series the oldest among the many devoted to "Multifrequency Studies of Cosmic Sources". The study of the physics governing the cosmic sources will be the main goal of the workshop. A session devoted to the ongoing and next generation ground- and space-based experiments will give the actual prospects for the first decades of this millennium.
Internet address

Cite this